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11313464 (1).ppt

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11313464 (1).ppt

  1. 1. Computer Storage
  2. 2. What is Primary Storage? ●Primary storage is computer memory that is directly accessible to the CPU of a computer without the use of the computer's input/output channels. ●Primary storage is used to store data that is likely to be in active use.
  3. 3. What is ROM? ●Read-only memory (ROM) is a class of storage media used in computers. ●Data stored in ROM cannot be modified. ●ROM is a non-volatile storage. Data remains unchanged even after switching off the computer.
  4. 4. What is RAM? ●Random access memory (RAM) is a type of data storage used in computers. ●Data stored in RAM can be modified. ●RAM is a volatile storage. Data will be lost after switching off the computer.
  5. 5. What is Secondary Storage? ●Secondary storage is computer memory that is not directly accessible to the CPU of a computer, requiring the use of a computer's input/output channels. ●It is used to store data that is NOT in active use. ●It is usually slower than primary storage, but it always has higher storage capacity. ●It is non-volatile. Data remains unchanged even after switching off the computer.
  6. 6. Secondary Storage Hard Disk ●Data can be read or write ●Speed of disk rotation usually 7200 rpm ●Data capacity: 80GB, 160GB, 250GB, 300GB
  7. 7. Secondary Storage CD DVD
  8. 8. Secondary Storage USB Flash Drives ●They are flash memory data storage devices integrated with a USB interface. ●They are typically small, lightweight, removable, and rewritable. ●Data capacity: 512MB, 1GB, 2GB, 4GB, 8GB, etc.
  9. 9. Secondary Storage Memory Cards ●Data can be read or write ●Data capacity: 512MB, 1GB, 2GB, 4GB, etc.

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